Ovel gear flow meter is a type positive displacement flowmeter. These are used primarily to measure volumetric flow of high viscosity fluids, such as: heavy petroleum products, epoxy resins and paints. It operates by repeatedly filling and emptying compartments of a known volume with a liquid. The flow rate is then calculated based on the number of times these compartments are filled and emptied. It is relatively simple; oval shaped gear-toothed rotors rotate within a chamber of specified geometry. As these rotors turn, they sweep out and trap a very precise volume of fluid between the outer oval shape of the gears and the inner chamber walls with none of the fluid actually passing through the gear teeth. It is suitable for used in lubricating oil, greases, fuels and additive applications.